N-N-disubstituted-ω-[2-amino-3-(carbonylmethyl)-3, 4-dihydroquinazolinyl]oxyalkylamides and related compounds

ABSTRACT

Pharmaceutical compositions comprising, or compositions consisting essentially of, compounds according to the formula ##STR1## or an optical isomer thereof are disclosed, wherein the substituents A, Z and R 1  are defined herein. The invention is also directed to certain compounds of the above class. The compounds of Formula I are cyclic AMP phosphodiesterase inhibitors useful as antithrombotic and inotropic agents and the like in mammals.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to novel substituted N-N-disubstituted-ω-[2-amino-3-(carbonylmethyl-)3,4-dihydroquinazolinyl]oxyalkylamides and related compounds. More specifically the compounds of interest are guanidino acid, ester and amide carbonyl compounds of the above class and their pharmaceutically acceptable acid addition salts.

2. Related Art

U.S. Pat. Nos. 4,551,459 and its parent 4,490,371 issued on Nov. 5, 1985 and Dec. 25, 1984, respectively, are directed to phosphodiesterase inhibitors having inotropic and anti-metastatic activities. More specifically, these patents along with U.S. Pat. No. 4,663,320, issued May 5, 1987 from U.S. patent appln. Ser. No. 744,100, are directed to (2-oxo-1,2,3,5-tetrahydroimidazo[2,1-b]quinazolinyl)oxyalkylamides and their pharmaceutically acceptable acid addition salts. These disclosures are hereby fully incorporated herein by reference.

SUMMARY OF THE INVENTION

In a first aspect, this invention is a pharmaceutical composition comprising a pharmaceutically acceptable excipient and a compound of the formula ##STR2## or an optical isomer thereof wherein

Z is O or NR² ;

n is an integer of 1 to 6;

R¹ and R² are independently hydrogen; alkyl of 1 to 12 carbon atoms; cycloalkyl of 3 to 8 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms; cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is unsubstituted or substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is unsubstituted or substituted with at least one lower alkyl, halo or lower alkoxy group or an --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; or R¹ and R² are combined with the N to which they are attached to form a cyclic secondary amine radical having from 5 to 8 atoms, where, in addition to the N atom, the atoms in the radical comprise carbon atoms and can include one oxygen or sulfur atom, or one optionally lower alkyl substituted nitrogen atom;

HX is optionally present and when present represents the acid portion of a pharmaceutically acceptable acid addition salt;

A is NR⁴ R⁵ wherein R⁴ and R⁵ are independently selected from the group consisting of: hydrogen; alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 2 to 6 carbon atoms; cycloalkyl of 3 to 8 carbon atoms or cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is unsubstituted or substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is unsubstituted or substituted with at least one lower alkyl, halo or lower alkoxy group or an --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; or wherein R⁴ and R⁵ are combined with the N to which they are attached to form a radical selected from the group consisting of: morpholinyl, piperidinyl, perhexylenyl, N-loweralkylpiperazinyl, pyrrolidinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, (±)-decahydroquinolinyl and indolinyl.

In a second aspect, this invention relates to a composition of matter consisting essentially of a compound of Formula I combined with at least one pharmaceutically acceptable excipient.

In still another aspect, this invention relates to a method of inhibiting platelet aggregation in a mammal.

In yet another aspect, this invention relates to a method for inhibiting 3',5'-cyclic AMP phosphodiesterase activity in a mammal, particularly, a human.

In yet another aspect, this invention relates to a method of treating heart failure in a mammal by stimulating suppressed heart activity which occurs during heart failure.

The above three methods comprise administering a therapeutically effective amount of a compound of Formula I alone or in admixture with a pharmaceutically acceptable excipient.

In a still further aspect, this invention relates to a compound of Formula I as defined above, except that when Z is O, R¹ can be, inter alia, alkyl of 3 to 12 carbon atoms rather than of 1 to 12 carbon atoms.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION Utility

Cyclic AMP is known to regulate the activity of numerous enzymes and mediates the action of several hormones. Studies have demonstrated that a deficiency in cyclic AMP or an increase in the activity of a high affinity cyclic AMP phosphodiesterase is associated with a variety of disease states. Compounds which are inhibitors of this enzyme are useful in the treatment or prevention of hypertension, asthma, diabetes, obesity, immune disfunctions, psoriasis, inflammation, cardiovascular disease, tumor metastasis, cancer and hyperthyroidism.

The compounds of this invention when administered to humans or mammals inhibit platelet cyclic AMP phosphodiesterase activity under physiological conditions. As a consequence, these compounds effect the inhibition of ADP-induced aggregation of human platelets. Thus, these compounds are administered to prevent or treat of a variety of conditions related to platelet aggregation and thrombosis, for example, intravascular thrombosis, prevention of coronary thrombosis, prevention of transient ischemic episodes and prevention of platelet thrombosis and the prevention of thrombosis, thrombocytopenia or platelet activation associated with the use of prosthethic devices (artificial heart valves, etc.).

Similarly, the compounds of the present invention also inhibit cardiac cyclic AMP phosphodiesterase, by cyclization under physiological conditions, resulting in a strengthening of myocardial contraction force by which the heart ventricles can pump the blood into the periphery. Consequently, these compounds also are useful as positive inotropic agents in treating myocardial failure.

Compounds of this invention exhibit certain exhibit advantages over compounds disclosed in U.S. Pat. No. 4,490,371 and its continuing applications. Specifically, the instant compounds offer greater solubility and more consistent oral bioavailability.

Definitions

The compounds of the present invention are numbered as follows: ##STR3##

For the purposes of this disclosure, the compounds of the present invention are represented as having the single structural formula set forth as Formula I. However, all tautomers are part of this invention, and are also to be considered as represented by Formula I. Specifically, the following tautomer is part of the invention: ##STR4##

The compounds of this invention may be prepared as structural isomers wherein the oxyalkylamide side chain is substituted on the benzene ring at any of the four different available positions. This fact is graphically represented in the generic formula by the drawing of the line into the benzene ring without it being directed to a particular carbon.

Also within the scope of this invention are the optical isomers of those compounds having an asymmetric center, such as when R¹, R², R³, R⁴ and R⁵ have chirality. In addition, A may be a substituent which has optical activity such as when A is a cyclic compound, for example, (+)- or (-)-decahydroquinolinyl.

Accordingly, the compounds of the present invention may be prepared either in optically active form or as racemic mixtures. Unless otherwise specified, where appropriate, products of the various synthetic steps described herein will be a racemic mixture. However, the scope of the subject invention herein is not limited to the racemic mixture, but is to encompass the separated individual optical isomers of the disclosed compounds.

If desired, the compounds herein may be resolved into their optical antipodes by conventional resolution means, for example, by separation (e.g. fractional crystallization) of the diastereomeric salts formed by the reaction of these compounds with optically active acids. Exemplary of such optically active acids are the optically active forms of camphor-10-sulfonic acid, 2-bromo-camphor-α-sulfonic acid, camphoric acid, menthoxyacetic acid, tartaric acid, malic acid, diacetyltartaric acid, pyrrolidine-5-carboxylic acid and the like. The separated pure diastereomeric salts may then be cleaved by standard means to afford the respective optical isomers.

For the purpose of this invention, the following phrases should be understood to have the recited meaning.

When reference is made to "alkyl of 1 to 12 carbon atoms" it is meant that there is a branched or unbranched saturated hydrocarbon chain containing, in total, that number of carbon atoms. The phrase refers specifically to such substituents as, for example, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, n-pentyl, neo-pentyl, n-hexyl and the like. The terms "alkyl of 1 to 4 carbon atoms" and "lower alkyl" are used interchangeably and mean methyl, ethyl, n-propyl, i-propyl, n-butyl, tert-butyl, i-butyl, sec-butyl, and the like. When the term "alkyl" or prefix "alk" (such as in alkoxy) is used without qualification (such as the term "lower"), a branched or unbranched saturated hydrocarbon chain having from 1 to 12 carbon atoms is contemplated.

"Lower alkoxy" means the group --OR wherein R is lower alkyl as defined in the foregoing paragraph.

An aliphatic radical is a radical that includes carbon and hydrogen atoms, but is not aromatic, such as an alkyl, cycloalkyl, or cycloalkyl lower alkyl radical.

"A cyclic secondary amine radical having from 5 to 8 atoms," as recited in the claims, means a radical derived from a commercially available secondary amine, or from a secondary amine that can be readily synthesized from a commercially available secondary amine by one of ordinary skill in the art. Examples of such radicals include morpholinyl, piperidinyl, pyrrolidinyl, and N-methyl piperazinyl.

"Carbamoyl" means the aminocarbonyl radical.

"Cycloalkyl" refers to a saturated aliphatic ring structure which contains the number of carbon atoms specified (3 to 8 carbon atoms if no specification is made), and which is substituted directly onto the Z group (i.e., oxygen or nitrogen) without any intervening methylene groups. Cycloalkyl of 3 to 12 carbon atoms includes bicyclic and tricyclic ring structures as well as unicyclic ones. Cycloalkyl radicals of 3 to 8 carbon atoms includes, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl. Cycloalkyl of 3 to 12 carbon atoms includes, for example, adamantyl as well as the foregoing radicals.

When reference is made to "cycloaklyl lower alkyl of 4 to 12 carbon atoms," it is meant that the substituents denoted as cycloalkyl of 3 to 8 carbon atoms in the preceding paragraph are attached to the nitrogen of the amide-forming group or the oxygen of the ester-forming group by means of a saturated branched or unbranched carbon chain which may have 1 to 4 carbon atoms. Such substituents are, for example, cyclohexylmethyl, cyclohexylethyl, cyclobutylmethyl, 4-cyclobutylbutyl, cyclopentylmethyl, 4-cyclopentylbutyl, cyclohexylmethyl, 4-cyclohexylbutyl, cycloheptylmethyl and 4-cycloheptylbutyl, to name a few examples.

In addition, the cycloalkyl or cycloalkyl lower alkyl radicals recited in the two foregoing paragraphs may be substituted with a radical chosen from the group consisting of lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, and --COO(R³) wherein R³ is lower alkyl.

Glycine-N-cyclohexylamide refers to the intermediate, C₆ H₁₁ --NH--CO--CH₂ --NH₂.

An "hydroxyalkyl" substituent is comprised of the specified number of carbon atoms (and of up to 6 carbon atoms if no specification is made), carbon, hydrogen and one oxygen atom, i.e. an alcohol wherein one terminal carbon atom is substituted on the amide nitrogen and the hydroxyl group is substituted on another carbon, preferably the ω-carbon. Herein the alkyl chain may be straight or branched, preferably straight, is fully saturated and, except for the hydroxyl group, has no other substitution. Examples of hydroxyalkyl substituents are 2-hydroxyethyl, 3-hydroxypropyl, 4-hydroxybutyl, 5-hydroxypentyl and 6-hydroxyhexyl. This is not an exhaustive list of hydroxyalkyl substituents which can be prepared or which can be used in this invention, but is merely intended to exemplify and identify that which is being referred to by the aforementioned phrase.

"Optionally" means that the described circumstance may or may not occur, and that the description includes instances where it occurs and instances where it does not occur. The phrase "optionally substituted" is used herein in conjunction with cycloalkyl and aryl substituents to indicate the ring may be have on it only hydrogen or, alternatively, may be substituted with one or more of the enumerated radicals as specifically indicated. Similarly, "optionally lower alkyl substituted nitrogen atom," used in conjunction with means that the second nitrogen atom, if present in the cyclic secondary amine radical, can be unsubstituted, or substituted with a lower alkyl radical. Likewise, the statement that HX is optionally present means that it can be present, or that the compound can be present in the form of the free base.

"Phenyl lower alkyl" means a group having at least one and up to four methylene groups with an ω-phenyl group. In this instance the carbon chain is linear, not branched. The phenyl group may be unsubstituted, i.e., contain only hydrogen, or it may be substituted with up to 5 substituents of a single functionality or a combination of the several recited substituents. Examples of unsubstituted phenyl lower alkyl are benzyl, phenylethyl, phenylpropyl and phenylbutyl. Examples of substituted phenyl lower alkyl are 4-halophenylalkyl, 2,4-dihalophenylalkyl, 2,4,6-trihalophenylalkyl or 2,3,4,5,6-pentahalo-phenylalkyl wherein halo is as defined below.

In addition, the phenyl group may be substituted with one or more lower alkyl groups such as methyl, ethyl, propyl or the like. One or more lower alkoxy groups may also be substituted on the phenyl ring. In addition, phenyl may be substituted with a radical chosen from the group consisting of --N(R³)₂, --NHCOR³, --COOH, and --COOR³ wherein R³ is lower alkyl.

The term "halo" refers to fluoro, chloro and bromo and iodo.

Perhexylenyl refers to the substituent dicyclohexyl-2-(2-piperidyl)ethane which is disclosed in British Pat. No. 1,025,578.

"Pharmaceutically acceptable acid addition salt" refers to those salts which retain the biological properties and efficacy of the free bases and which are not biologically or otherwise undesirable, formed with inorganic or organic acids. Inorganic acids which may be used are, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like. Exemplary organic acids are acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, malic acid, malonic acid, succicic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, salicylic acid and the like.

A pharmaceutically acceptable excipient is to be broadly understood to include any carrier, analgesic, vitamin, or other substance, such as an inert pharmaceutical additive to facilitate formulation, that is acceptable for administration to a human patient from a toxicity viewpoint and that will not substantially interfere with the administration of the active compound. Suitable excipients include water, aspirin, saline, dextrose, glycerine, ethanol, and the like; pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talcum, cellulose, glucose, sucrose, magnesium carbonate, and the like; polyalkylene glycols such as, for example, propylene glycol; and nontoxic auxiliary substances such as wetting or emulsifying agent, pH buffering agents and the like, for example, sodium acetate, sorbitan monolaurate, triethanolamine sodium acetate, triethanolamine oleate, etc.

Administration and Dosage

Administration of the compounds and salts thereof described herein can be via any of the accepted modes of administration for agents which are cyclic AMP phosphoriesterase inhibitors. These methods include oral, parenteral and otherwise systemic or aerosol forms.

Depending on the intended mode of administration, the compositions used may be in the form of solid, semi-solid or liquid dosage forms, such as, for example, tablets, suppositories, pills, capsules, powders, liquids, suspensions, or the like, preferably in unit dosage forms suitable for single administration of precise dosages. The compositions will include a conventional pharmaceutical carrier or excipient and an active compound of Formula I or the pharmaceutically acceptable salts thereof and, in addition, may include other medicinal agents, pharmaceutical agents, carriers, adjuvants, etc.

For oral administration, a pharmaceutically acceptable non-toxic composition is formed by the incorporation of any of the normally employed excipients, such as, for example pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talcum, cellulose, glucose, sucrose, magnesium, carbonate, and the like. Such compositions take the form of solutions, suspensions, tablets, pills, capsules, powders, sustained release formulations and the like. Such compositions may contain between about 1% and about 99% active ingredient, but preferably contain between about 10% and about 50% active ingredient.

Parenteral administration is generally characterized by injection, either subcutaneously, intramuscularly or intravenously. Injectables can be prepared in conventional forms, either as liquid solutions or suspensions, solid forms suitable for solution or suspension in liquid prior to injection, or as emulsions. Suitable excipients are, for example, water, saline, dextrose, glycerol, ethanol or the like. In addition, if desired, the pharmaceutical compositions to be administered may also contain minor amounts of non-toxic auxiliary substances such as wetting or emulsifying agents, pH buffering agents and the like, such as for example, sodium acetate, sorbitan monolaurate, triethanolamine oleate, etc.

A more recently devised approach for parenteral administration employs the implantation of a slow-release or sustained-release system, such that a constant level of dosage is maintained. See, e.g., U.S. Pat. Nos. 3,710,795 and 3,773,919.

For systemic administration via suppository, traditional binders nd carriers include, e.g. polyalkylene glycols or triglycerides. Such suppositories may be formed from mixtures containing active ingredient in the range of about 0.5% to about 10%; and preferably in the range of from about 1 to about 2%.

The amount of active compound administered will of course, be dependent on the subject being treated, the type and severity of the affliction, the manner of administration and the judgment of the prescribing physician. In any case, a therapeutically effective amount of the drug either alone or in combination with the various excipients listed above or otherwise known will be administered. For the purpose of this invention, "a therapeutically effective amount" refers to an amount in the range of from about 0.1 to about 25 mg/kg of body weight, and preferably from about 1 to about 10 mg/kg.

Preferred Embodiments

Preferred embodiments of the present invention are compounds, compositions and methods wherein Formula I, Z is O; n is 3 or 4; and R¹ is an aliphatic radical having more than three carbon atoms and branching at the first or second carbon from the oxygen atom.

More preferred embodiments are directed to those compounds described in the preceding paragraph wherein A is NR⁴ R⁵ and the R⁴ and R⁵ substituents are independently selected from the group consisting of: alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms; cycloalkyl of 3 to 8 carbon atoms, cycloalkyl lower alkyl of 4 to 12 carbon atoms; and optical isomers of the class of compounds.

Most preferred embodiments are directed to those compounds described above wherein A is NR⁴ R⁵ and R⁴ is alkyl of 1 to 6 carbon atoms and R⁵ cycloalkyl of 3 to 8 carbon atoms, and optical isomers of the class of compounds. Most particularly preferred are compounds that cyclize to N-cyclohexyl-N-methyl-4-(2-oxo-1,2,3,5-tetrahydroimidazo-[2,1-b]quinazolin-7-yl)oxybutyramide, i.e., compounds wherein n is 3, R⁴ is cyclohexyl, R⁵ is methyl, and the oxybutyramide group is attached to the 6-position of the quinazoline ring.

In addition to the above classes of preferred compounds for use in the compositions and methods of this invention, a presently particularly preferred embodiment uses N-cyclohexyl-N-methyl-4-[2-amino-3-(ethoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, and the pharmaceutically acceptable salts thereof.

The preferred pharmaceutically acceptable salts are HCl, HBr, H₂ SO₄, HNO₃ and H₃ PO₄.

PREPARATION AND EXAMPLES

Compounds of the present invention can be made by Reaction Scheme I. The starting material (1) is fully taught in U.S. Pat. Nos. 4,490,371 and 4,551,459, issued 12/25/84 and 11/5/85, respectively, and hereby fully incorporated into the instant disclosure by reference. Briefly, the process for preparing the starting material (1), a nitro-aldehyde amide, begins with a hydroxy-2-nitrobenzaldehyde which is reacted with an ω-haloalkylester which serves to introduce the alkyl side chain onto the benzene ring. The ester is then hydrolyzed, converted to the acid chloride and treated with the appropriate secondary amine to form the amide. The starting material (2), an ester or amide derivative of glycine, is prepared in accordance with Reaction Scheme II or III. The nitro-aldehyde amide (1) is reacted with the α-amino acid derivative (2). This reaction is followed by a reduction step, and then by a cyclization step employing a halo cyanogen. ##STR5##

Regarding the starting material (2), the required ester or amide derivatives of glycine may be prepared by either of two convenient routes set forth below as Reaction Schemes II and III. In Scheme II (Preparations 1 and 2) acylation of an alcohol or primary or secondary amine with an α-halo acetyl chloride is carried out using a tertiary amine base, such as triethylamine or N,N-dimethylaniline in an anhydrous aprotic solvent, such as diethyl ether or tetrahydrofuran. Displacement of the halide with sodium azide, followed by catalytic (or other) reduction and treatment with hydrogen chloride, affords the glycine ester or amide hydrochloride. ##STR6##

Alternatively, as shown in Scheme III (Preparation 3), commercially available N-protected glycine derivatives, such as but not limited to N-Boc-glycine or N-Cbz-glycine, can be converted into activated acylating agents using any of a variety dehydrating reagents, such as carbonyl diimidazole (CDI) or dicyclohexylcarbodiimide (DCC) or the like. The resulting activated glycine derivative is treated in situ with an alcohol or primary or secondary amine to afford the protected ester or amide. Deprotection under the appropriate conditions affords the glycine derivatives as in Scheme II. ##STR7##

Once the starting materials [formulas (1) and (2)] are prepared as outlined above, compounds of formula (1) may be reacted with compounds of formula (2) to yield the compounds of formula (3): the nitroaldehyde amide (1) is condensed by reductive amination (Step A) with an excess of the glycine ester or amide (2), to give the benzylamine (3). Generally, the reaction is carried out at a temperature between about 0° and about 50° C., preferably ambient temperature. A time of between about 0.5 to about 8 hours is sufficient to effect the reaction, though about 2 to about 3 hours is preferable. The reaction is generally carried out in a polar solvent such as an alcohol, for example, methanol, ethanol, propanol, or the like in which the nitroaldehyde-amide and the glycine ester or amide hydrochloride are soluble. It is preferable to add a water-scavenging agent such as molecular sieves in order to remove water generated during the reaction process.

Initially, a reaction mixture is prepared which contains the aldehyde of formula (1), about a two-fold molar amount of the α-amino acid ester of formula (2) as an acid addition salt, and the water scavenging agent. The solution is generally maintained between about 10° to 30° C. for between about 10 minutes and about 3 hours, preferably about 30 minutes, and then there is added a cyanoborohydride reducing agent in a molar amount of about one-half that of the carbonyl compound. The reaction is allowed to proceed at a temperature between about 10° to 30° C., preferably at room temperature for a period of between about 1 to about 6 hours, preferably about 1 to about 2 hours.

While the reaction product may be isolated for characterization, by crystallization or chromatography, for example, such isolation is not necessary. It is most convenient to simply remove precipitated solids, i.e., the molecular sieves and borate salts, by filtration, evaporate the solvent and to take up the residue in an organic solvent. This solution may then be washed with a base and brine to remove impurities, after which the solvent is removed and the resulting residue used directly in the next reaction step.

Reduction of the nitro group (Step B) can be effected by many methods known in the art, but is most conveniently carried out by catalytic hydrogenation. This reaction may be accomplished by conventionally known means. As practiced herein, the residue from the previous reaction step is dissolved in an appropriate solvent such as, for example, a simple alcohol such as methanol or ethanol. A transition metal catalyst which will selectively reduce the nitro group to the amine without affecting the ester and/or amide(s) or the phenyl ring is preferred. A preferred catalyst is a palladium catalyst and most peferably it will be palladium on carbon such as the readily available 10% palladium/carbon catalyst. A small amount of the palladium/carbon catalyst, i.e., between about 0.5 and about 1.5 grams per 100 mmol substrate, will generally be sufficient to effect the reduction. The alcoholic reaction mixture is placed under hydrogen at room temperature and between about 1 to about 3 atmospheres of hydrogen pressure and allowed to proceed until hydrogen uptake has ceased. Isolation of the hydrogenation product is readily accomplished by filtration to remove the catalyst after which the reaction product may be used directly in the following step.

Cyclization of the amine (Step C) is achieved by means of a cyanogen halide, preferably the bromide. A 5 to 10% molar excess of cyanogen halide is added to the solution from the previous reaction. The resulting solution is stirred overnight preferably about 16 hours at temperatures between ambient and reflux, preferably at ambient temperature. The product (I) is isolated by evaporation of the solvent at reduced pressure and at temperatures less than about 40° C., followed by drying at high vacuum and/or recrystallization.

Interconversion of the products can be effected in some instances, as shown in Reaction Scheme IV (preparations 5 and 6). The tert-butyl ester is acid labile, affording the free acid upon cleavage. (While this acid is, in principle, available by either alkaline or acid hydrolysis of any ester or amide, the harsh conditions required for such a conversion would afford the ring closed product, disclosed in U.S. Pat. Nos. 4,551,459 and 4,490,371.) Under anhydrous conditions, the free acid can then be converted into most every other ester of a primary or secondary alcohol by transesterification. This provides two routes to claimed compounds where X=0. ##STR8##

Salts of the compounds of Formula I may be interchanged by taking advantage of differential solubilities of the salts, volatilities or acidities of the acids, or by treating with the appropriately loaded ion exchange resin. For example, the interchange is effected by the reaction of a salt of the compounds of Formula I with a slight stoichiometric excess of an acid of a lower pKa than the acid component of the starting salt. This conversion is carried out at a temperature between about 0° C. and the boiling point of the solvent, preferably at ambient temperature.

The following Preparations and Examples illustrate how to make the starting materials and compounds of this invention, respectively. They are intended to be illustrative, but not limiting. Preparations 1 through 3 yield the starting material of formula (2). Example 1 yields the preferred product of Formula I. Examples 2 and 3 illustrate interconversion to other compounds of Formula I. The remainder of the Examples are directed to formulations and biological data.

PREPARATION 1 Glycine Cyclohexyl Ester Hydrochloride

Chloroacetyl chloride (40 mL, 500 mmol) was added dropwise to a solution of cyclohexanol (52 mL, 500 mmol) and triethylamine (77 mL, 550 mmol) in diethyl ether cooled to below 5° C. Upon completion of the addition, the mixture was filtered to remove triethylamine hydrochloride. The filtrate was washed twice with 1M HCl and twice with brine, and was then dried over MgSO₄, filtered and evaporated to afford cyclohexyl chloroacetate (86.5 g, 490 mmol, 98%) as a colorless liquid, bp 100° C./5 mm. The chloroacetate (79.5 g, 450 mmol) was added dropwise to a suspension of sodium azide (36.6 g, 563 mmol) in dimethylformamide (60 mL) maintained below 20° C. The mixture was stirred at room temperature overnight, and then was poured into water (200 mL), and the solution was extracted with ether (4×200 mL). The combined organic extracts were washed with brine, then dried, filtered and evaporated to yield cyclohexyl azidoacetate (78.4 g, 428 mmol, 95%) as a colorless liquid, b.p. 85°-90° C. (0.1 mm). Catalytic reduction of the azide with hydrogen over 10% palladium on carbon in ethanol afforded cyclohexyl glycinate, treatment of which with dry HCl afforded glycine cyclohexyl ester HCl, m.p. 144°-145° C., in quantitative yield after crystallization from diethyl ether.

Similarly prepared are the following glycine ester hydrochlorides, a few of which are commercially available or previously reported in the literature:

glycine t-butyl ester HCl;

glycine isopropyl ester HCl;

glycine 2,6-dimethylcyclohexyl ester HCl;

glycine cyclopentyl ester HCl;

glycine cyclohexylmethyl ester HCl;

glycine adamantyl ester HCl;

glycine adamantylmethyl ester HCl;

glycine isobutyl ester HCl;

glycine neopentyl ester HCl;

glycine phenyl ester HCl;

glycine 2,6-dimethylphenyl ester HCl;

glycine 1-phenylethyl ester HCL;

glycine 2,2-dimethyl-3-butyl ester HCL;

glycine 2-phenyl-2-propyl ester HCL;

glycine benzyl ester HCL;

glycine 2,4,6-trimethyl benzyl ester HCL;

glycine trichloromethyl-2-propyl ester HCL; and

glycine 2,4,6-trimethylphenyl ester HCL.

PREPARATION 2 Glycine-N-Cyclohexylamide HCl

Chloroacetyl chloride (20 mL, 250 mmol) was added dropwise to a chilled solution of cyclohexylamine (57 mL, 500 mmol) in pentane (300 mL). After 1 hour at room temperature, the mixture was diluted with ethyl acetate (500 mL), and was treated with 1M HCl (250 mL). The layers were separated, and the organic extract was washed with 1M HCl, saturated sodium bicarbonate and brine. Evaporation after drying afforded 37 g (211 mmol, 84%) of a white solid, m.p. 108°-109° C. Conversion of the chloroacetamide to the azide and subsequent reduction to the amine and treatment with dry HCl (as in Preparation 1) afforded glycine-N-cyclohexylamide hydrochloride.

Similarly prepared were:

glycine N-isopropylamide hydrochloride;

glycine N,N-dimethylamide hydrochloride;

glycine 1-piperidinylamide hydrochloride;

glycine 4-morpholinylamide hydrochloride;

glycine N-t-butylamide hydrochloride; and

glycine anilide hydrochloride.

PREPARATION 3

N,N-Dicyclohexylcarbodiimide (54 g, 265 mmol) was added to a solution of N-Boc glycine (43.8 g, 250 mmol) in ethyl acetate. After stirring at 10° C. for 15 min, morpholine (26 mL, 300 mmol) was added dropwise. The mixture was stirred overnight at room temperature, and then was filtered. The filtrate was washed with water, 1M NaHSO₄, aq. NaHCO₃ and brine, and then was dried, filtered and concentrated. Crystallization of the residue from ether-ethyl acetate afforded N-t-Boc-glycine morpholinylamide, m.p. 122°-123° C. Treatment with hydrogen chloride in ethyl acetate afforded quantitatively, glycine 4-morpholinylamide hydrochloride, m.p. 218°-220° C. Most esters or amides of Preparations 1 or 2 can be prepared by this alternative method where convenient.

By using N-Cbz-glycine in place of N-Boc glycine in this Preparation, removal of the protecting group is effected by hydrogenation over Palladium/carbon catalyst to afford the esters or amides previously mentioned, but especially in cases where the ester is acid labile.

EXAMPLE 1 N-Cyclohexyl-N-methyl-4-[2-amino-3-(ethoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide Hydrobromide A. Preparation of the Title Compound

Anhydrous sodium acetate (4.1 g, 50 mmol) was added to a warm solution of glycine ethyl ester hydrochloride (8.4 g, 60 mmol) in absolute ethanol (200 mL). The resulting mixture was stirred overnight at room temperature and was then filtered. N-Cyclohexyl-N-methyl-4-(3-formyl-4-nitrophenyl)-oxybutyramide (8.7 g, 25 mmol) was added, followed by sodium cyanoborohydride (0.95 g, 15 mmol) in 30 minutes. After 3 hours, the solution was evaporated, and the residue was partitioned between ethyl acetate and saturated sodium bicarbonate (300 mL each). The organic extract was washed with additional aqueous sodium bicarbonate and with brine, then dried, filtered and evaporated to give the nitroamine as a thick syrup. The crude nitroamine was dissolved in absolute ethanol (100 mL) and was hydrogenated over 10% Pd-C (1.0 g) until uptake ceased, approximately 4 hours. The catalyst was removed by filtration through a Celite pad, and the pad was washed clean with additional absolute ethanol (50 mL). The combined filtrates were treated with cyanogen bromide (3.20 g, 30 mmol), and the resulting solution was stirred at room temperature for 16 hours. Thorough evaporation of the ethanolic solution afforded a quantitative yield of the title compound as an amorphous solid, m.p. 91°-92° C.

B. Preparation of Other Compounds of Formula I Using Intermediates of Preparations 1 to 3 Herein

By substituting any of the glycine ester or amide hydrochlorides of Preparations 1 to 3 into this procedure, the corresponding 2-amino-3,4-dihydroquinazoline ester or amide hydrobromides are prepared and isolated as the hydrobromide salts;

1. Esters

N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 78°-81° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 77°-79° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(isopropoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 61°-63° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylcyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(phenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(1-phenylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 60°-62° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2,2-dimethyl-3-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 45°-48° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2-phenyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethylbenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(2-trichloromethyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; and

N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide.

2. Amides

N-cyclohexyl-N-methyl-4-[2-amino-3-(carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 74°-75° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(N-t-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(4-morpholinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 50°-52° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-(1-piperidinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-N-phenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, m.p. 84°-86° C.;

N-cyclohexyl-N-methyl-4-[2-amino-3-N-isopropylcarbamoylmethyl)-3,4-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; and

N-cyclohexyl-N-methyl-4-[2-amino-3-(N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide.

C. Preparation of Other Compounds of Formula I Using Intermediates Disclosed in U.S. Pat. Nos. 4,551,459 and 4,490,371

By substituting any other nitroaldehyde amide of Formula I previously disclosed in U.S. Pat. Nos. 4,551,459 and 4,490,371 for N-cyclohexyl-N-methyl-4-(3-formyl-4-nitrophenyl)oxybutyramide incorporated herein by reference, the corresponding 2-amino-3,4-dihydroquinazoline ester or amide hydrobromides are prepared and isolated as the hydrobromide salt:

1. Esters

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexylmethyl-N-hydroxyethyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-hexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dimethyl-4-[2-amino-3-(sec-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-ethyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-pentyl-N-methyl-4-[2-amino-3-(isopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-hexyl-N-hydroxyethyl-4-[2-amino-3-(tertpentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dihexyl-4-[2-amino-3-(isohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dipentyl-4-[2-amino-3-(cyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-6-hydroxyhexyl-4-[2-amino-3-(2-hydroxypropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-n-hexyl-4-[2-amino-3-(cyclohexylmethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-methyl-4-[2-amino-3-(2-methoxycyclohexylmethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopropylmethyl-N-methyl-4-[2-amino-3-(2-dimethylaminophenylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cycloheptyl-N-methyl-4-[2-amino-3-(phenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylbutyl-N-methyl-4-[2-amino-3-(3-bromocyclopentylmethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylmethyl-N-methyl-4-[2-amino-3-(cyclopentylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-butyl-4-[2-amino-3-(3-ethoxycarbonylbenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-hydroxyethyl-4-[2-amino-3-(2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylmethyl-N-hydroxyethyl-4-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylbutyl-N-hydroxyethyl-4-[2-amino-3-(phenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(3-methoxycarbonylaminobenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-4-hydroxy-n-butyl-4-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(4-methoxyphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-hexyl-4-[2-amino-3-(2,4-dimethoxyphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-hydroxyhexyl-4-[2-amino-3-(2,4-dichlorophenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-6-hydroxyhexyl-4-[2-amino-3-(2,6-dimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-n-butyl-4-[2-amino-3-(cyclopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(carboxymethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(3-methoxycyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

morpholinyl-4-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

piperidinyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

pyrrolidinyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

N-methylpiperazinyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

tetrahydroquinolinyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

tetrahydroisoquinolinyl-4-[2-amino-3-(2-chlorophenyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

indolinyl-4-[2-amino-3-(2-dimethylaminophenyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-4-hydroxy-n-butyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-n-hexyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(2-chlorophenoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(2-dimethylaminophenoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(2-chlorophenoxyoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(2-dimethylaminophenoxyoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-diphenylmethyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(2-dimethylaminophenoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(2-dimethylaminophenoxyoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-3-hydroxypropyl-2-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-cyclohexyl-N-hydroxypropyl-2-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-phenyl-N-hydroxypropyl-2-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-cyclohexyl-N-butyl-2-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

(±)-decahydroquinolinyl-2-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-2-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyhexyl-2-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-cyclohexyl-N-propyl-2-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

N-phenyl-N-methyl-2-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-benzyl-N-hydroxyethyl-2-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-2-[2-amino-3-(neopentoxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-phenyl-N-hydroxyethyl-2-[2-amino-3-(isopentoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-5-[2-amino-3-(2-dimethylaminophenoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclohexyl-N-hydroxyhexyl-5-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N-cyclohexyl-N-methyl-5-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-cyclohexyl-N-hexyl-5-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxypentanamide;

N-cyclopentyl-N-6-hydroxyhexyl-5-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclopentyl-N-hydroxypropyl-5-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N-cyclopentyl-N-methyl-5-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-cyclopentyl-N-hexyl-5-[2-amino-3-(2-dimethylaminophenoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxypentanamide;

N-hexyl-N-methyl-5-[2-amino-3-(isopropyl-oxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxy-pentanamide;

N,N-dimethyl-5-[2-amino-3-(methoxy-carbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N,N-dihexyl-5-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-phenyl-N-methyl-5-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclohexyl-N-hydroxypropyl-6-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyhexanamide;

N-phenyl-N-4-hydroxypropyl-6-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyhexanamide;

N-cyclohexyl-N-butyl-6-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyhexanamide;

(±)-decahydroquinolinyl-6-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxyethyl-6-[2-amino-3-(2-chlorophenoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxypropyl-6-[2-amino-3-(2-dimethylaminophenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyhexanamide;

N-cyclohexyl-N-propyl-6-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyhexanamide;

N-phenyl-N-methyl-6-[2-amino-3-(cyclopentylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxyethyl-7-[2-amino-3-(3-ethoxycarbonylbenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyheptanamide;

N-cyclohexyl-N-hydroxyhexyl-7-[2-amino-3-(2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyheptanamide;

N-cyclohexyl-N-n-hexyl-7-[2-amino-3-(methoxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyheptanamide;

N-benzyl-N-methyl-7-[2-amino-3-(phenoxycarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyheptanamide;

N,N-dibenzyl-7-[2-amino-3-(3-methoxycarbonylaminobenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxyheptanamide;

N-diphenylmethyl-N-methyl-7-[2-amino-3-(isopropyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyheptanamide;

(±)-decahydroquinolinyl-7-[2-amino-3-(3-ethoxycarbonylbenzyloxycarbonylmethyl)-3,4-dihydroquinazolin-7-yl]oxyheptanamide; and

N-cyclohexyl-N-hydroxyethyl-7-[2-amino-3-(2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyheptanamide.

2. Amides

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexylmethyl-N-hydroxyethyl-4-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-hexyl-N-methyl-4-[2-amino-3-(N-iso-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dimethyl-4-[2-amino-3-(N-sec-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-ethyl-N-methyl-4-[2-amino-3-(N-neopentylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-pentyl-N-methyl-4-[2-amino-3-(N-isopentylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-hexyl-N-hydroxyethyl-4-[2-amino-3-(N-tert-pentylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dihexyl-4-[2-amino-3-(N-isohexyl-carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dipentyl-4-[2-amino-3-(N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-6-hydroxyhexyl-4-[2-amino-3-(N-2-hydroxypropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-n-hexyl-4-[2-amino-3-(N-cyclohexylmethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-methyl-4-[2-amino-3-(N-2-methoxycyclohexylmethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopropylmethyl-N-methyl-4-[2-amino-3-(N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cycloheptyl-N-methyl-4-[2-amino-3-(N,N-diphenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylbutyl-N-methyl-4-[2-amino-3-(N-3-bromocyclopentylmethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylmethyl-N-methyl-4-[2-amino-3-(N-cyclopentylethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-butyl-4-[2-amino-3-(N,N-diethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentyl-N-hydroxyethyl-4-[2-amino-3-(N-2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylmethyl-N-hydroxyethyl-4-[2-amino-3-(N-methyl-N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclopentylbutyl-N-hydroxyethyl-4-[2-amino-3-(N,N-diphenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(N-3-methylphenyl-N-benzylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-4-hydroxy-n-butyl-4-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(N-4-methoxyphenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-hexyl-4-[2-amino-3-(N-2,4-dimethoxyphenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-hydroxyhexyl-4-[2-amino-3-(N-2,4-dichlorophenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-phenyl-N-6-hydroxyhexyl-4-[2-amino-3-(N-methyl-N-2,6-dimethylphenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-cyclohexyl-N-n-butyl-4-[2-amino-3-(N-cyclopentyl-N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(N-carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(N-3-methoxycyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide;

morpholinyl-4-[2-amino-3-(N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

piperidinyl-4-[2-amino-3-(N-benzylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

pyrrolidinyl-4-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

N-methylpiperazinyl-4-[2-amino-3-(N-neopentyln-methylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

tetrahydroquinolinyl-4-[2-amino-3-(N-propyl-N-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

tetrahydroisoquinolinyl-4-[2-amino-3-(N-octyl-N-2-chlorophenylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

indolinyl-4-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(N-cyclohexyl-N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(N-benzylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-4-hydroxy-n-butyl-4-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-cyclohexyl-N-n-hexyl-4-[2-amino-3-(N-neopentylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(N-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(N-2-chlorophenylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(N-benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(N-neopentylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(N,N-di-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(N-2-chlorophenylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dicyclohexyl-4-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

(±)-decahydroquinolinyl-4-[2-amino-3-(N-methoxycarbonylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-diphenylmethyl-N-methyl-4-[2-amino-3-(N-benzyl-N-butoxycarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-hydroxyethyl-4-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-methyl-4-[2-amino-3-(N-neopentyl-N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-phenyl-N-methyl-4-[2-amino-3-(N-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-benzyl-N-methyl-4-[2-amino-3-(N-methyl-N-2-dimethylaminophenyl-carbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N,N-dibenzyl-4-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxybutyramide;

N-cyclohexyl-N-3-hydroxypropyl-2-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-cyclohexyl-N-hydroxypropyl-2-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-phenyl-N-hydroxypropyl-2-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-cyclohexyl-N-butyl-2-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

(±)-decahydroquinolinyl-2-[2-amino-3-(N-isobutyl-N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-2-[2-amino-3-(N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyhexyl-2-[2-amino-3-(N-cyclohexyl-N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-cyclohexyl-N-propyl-2-[2-amino-3-(N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

N-phenyl-N-methyl-2-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyacetamide;

N-benzyl-N-hydroxyethyl-2-[2-amino-3-(N-iso-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-2-[2-amino-3-(N-hydroxymethyl-N-neopentcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyacetamide;

N-phenyl-N-hydroxyethyl-2-[2-amino-3-(N-isopentylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyacetamide;

N-cyclohexyl-N-hydroxyethyl-5-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclohexyl-N-hydroxyhexyl-5-[2-amino-3-(N,N-diisopropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N-cyclohexyl-N-methyl-5-[2-amino-3-(N-methcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-cyclohexyl-N-hexyl-5-[2-amino-3-(N-benzylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxypentanamide;

N-cyclopentyl-N-6-hydroxyhexyl-5-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclopentyl-N-hydroxypropyl-5-[2-amino-3-(N-neopentylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N-cyclopentyl-N-methyl-5-[2-amino-3-(N-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-cyclopentyl-N-hexyl-5-[2-amino-3-(N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxypentanamide;

N-hexyl-N-methyl-5-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N,N-dimethyl-5-[2-amino-3-(N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxypentanamide;

N,N-dihexyl-5-[2-amino-3-(N-benzylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxypentanamide;

N-phenyl-N-methyl-5-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxypentanamide;

N-cyclohexyl-N-hydroxypropyl-6-[2-amino-3-(N-benzylcarbamoyl-methyl)-3,4-dihydroquinazolin-5-yl]oxyhexanamide;

N-phenyl-N-4-hydroxypropyl-6-[2-amino-3-(N-tert-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl)oxyhexanamide;

N-cyclohexyl-N-butyl-6-[2-amino-3-(N-neopentylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyhexanamide;

(±)-decahydroquinolinyl-6-[2-amino-3-(N-isobutylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxyethyl-6-[2-amino-3-(N-2-chlorophenylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxypropyl-6-[2-amino-3-(N-cyclohexyl-N-2-dimethylaminophenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxyhexanamide;

N-cyclohexyl-N-propyl-6-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyhexanamide;

N-phenyl-N-methyl-6-[2-amino-3-(N-cyclopentylethylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyhexanamide;

N-cyclohexyl-N-hydroxyethyl-7-[2-amino-3-(N-3-ethoxycarbonylbenzylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyheptanamide;

N-cyclohexyl-N-hydroxybutyl-7-[2-amino-3-(N-2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxyheptanamide;

N-cyclohexyl-N-n-hexyl-7-[2-amino-3-(N-methylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyheptanamide;

N-benzyl-N-methyl-7-[2-amino-3-(N-phenylcarbamoylmethyl)-3,4-dihydroquinazolin-8-yl]oxyheptanamide;

N,N-dibenzyl-7-[2-amino-3-(N-3-methylcarbonylaminobenzylcarbamoylmethyl)-3,4-dihydroquinazolin-5-yl]oxyheptanamide;

N-diphenylmethyl-N-methyl-7-[2-amino-3-(N-isopropylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxyheptanamide;

(±)-decahydroquinolinyl-7-[2-amino-3-(N-3-ethoxycarbonylbenzylcarbamoylmethyl)-3,4-dihydroquinazolin-7-yl]oxyheptanamide; and

N-cyclohexyl-N-hydroxyethyl-7-[2-amino-3-(N-2-dimethylaminocyclohexylcarbonylmethyl)-3,4-dihydroquinazolin-8-yl]oxyheptanamide.

EXAMPLE 2 N-Cyclohexyl-N-methyl-4-[2-amino-3-carboxymethyl-3,4-dihydroquinazolin-6-yl]oxybutyramide

The t-butyl ester, prepared as described in Example 1, was suspended in acetic acid and treated with 30% HBr/HOAc (1 mL/g). After 3 hours at room temperature, diethyl ether was added, and the mixture was filtered to give the title compound in quantitative yield as an amorphous solid, m.p. 125°-128° C.

EXAMPLE 3 Ester Interconversion

A suspension of the t-butyl ester prepared in Example 1, in ethanol, was treated with dry HBr in ethanol (2 mL/g). After stirring at ambient temperature overnight, the resulting solution was thoroughly evaporated to afford the ethyl ester hydrobromide of Example 1. Similarly, by substituting any non-acid sensitive alcohol for ethanol, the corresponding esters of Example 1 can be prepared.

EXAMPLE 4

Compounds of the present invention, either the free base or a pharmaceutically acceptable acid addition salt, may be orally administered to a subject as a tablet. While the active ingredient may comprise anywhere between 1 and 99 percent of the formulation that percentage preferably will be an amount which will cause to be delivered to the subject, the active ingredient in an amount of between 20 mg and 100 mg per tablet. Following is a representative tablet formulation in which the active ingredient is N-cyclohexyl-N-methyl-4-[2-amino-3-(ethoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]-oxybutyramide hydrobromide. However, the formulation profile given below may be used to formulate a tablet for any of the compounds represented by Formula I.

    ______________________________________                                                          Quantity per                                                  Ingredients      tablet, mgs.                                                  ______________________________________                                         Active ingredient                                                                               25                                                            cornstarch       20                                                            lactose, spray-dried                                                                            153                                                           magnesium stearate                                                                               2                                                            ______________________________________                                    

The above ingredients are thoroughly mixed and pressed into single scored tablets.

EXAMPLE 5

An alternative oral dosage form is to fill hard shell gelatin capsules with a powder containing the active ingredient in the desired amount. Using the active ingredient mentioned in Example 6 above, the acid addition salts, or any other compound according to Formula I there may be prepared an exemplary hard shell gelatin capsule formulation using the following ingredients

    ______________________________________                                                          Quantity per                                                  Ingredients      tablet, mgs.                                                  ______________________________________                                         Active ingredient                                                                               100                                                           lactose, spray-dried                                                                            148                                                           magnesium stearate                                                                               2                                                            ______________________________________                                    

The above ingredients are mixed and introduced into a hard-shell gelatin capsule.

EXAMPLE 6

Alternatively, compounds of the present invention may be prepared as a suspension for oral administration. Any of the compounds of Formula I, either in free base form or as the acid addition salt, may be used in this formulation.

An oral suspension is prepared having the following composition:

    ______________________________________                                         Ingredients                                                                    ______________________________________                                         Active ingredient  0.1          g                                              fumaric acid       0.5          g                                              sodium chloride    2.0          g                                              methyl paraben     0.1          g                                              granulated sugar   25.5         g                                              sorbitol (70% solution)                                                                           12.85        g                                              Veegum K (Vanderbi1t Co.)                                                                         1.0          g                                              flavoring          0.035        ml                                             colorings          0.5          mg                                             distilled water    q.s. to 100  ml                                             ______________________________________                                    

EXAMPLE 7 Inotropic Activity of the Compounds of the present Invention

Mongrel dogs were anesthetized intravenously with 35 mg/Kg sodium pentobarbital and supplemented as needed. Blood pressure was measured with a Statham pressure transducer via a cannula inserted from a femoral artery into the abdominal aorta. Heart rate was recorded by a cardiotachometer from a lead II electrocardiogram. Right ventricular contractile force was recorded from a Walton-Brodie strain gauge sutured to the right ventricle following a midsternal thoracotomy. A Harvard respirator was used to ventilate the dogs with room air through an endotracheal tube. The dog was bilaterally vagotomized. Following a midline laparotomy, a cannula was sutured into the duodenum for intraduodenal administration of test compound. A femoral vein was cannulated for administration of isoproterenol. All data were recorded on a Beckman R611 Dynograph.

To assess the responsiveness of each dog, isoproterenol was given intravenously at half-log interval doses from 0.007 to 2.1 or 6.67 mcg/Kg. The test compound was then administered intraduodenally, at dose levels from 0.316 to 3.16 mg/Kg.

The test results are summarized in the following Table.

                  TABLE I                                                          ______________________________________                                                       Peak Effects as % of Max.                                                      Isoproterenol                                                               dose     Rt. Ventricular                                                       (mg/kg,  Contractile Heart Blood                                    Compound   i.d.)    Force       Rate  Pressure                                 ______________________________________                                         N--cyclohexyl-                                                                            0.316    38          32    22                                       N--methyl-4-[2-                                                                           1.0      62          50    60                                       amino-3-   3.16     60          52    80                                       (ethoxycarbonyl                                                                methyl)-3,4-                                                                   dihydro-                                                                       quinazolin-6-                                                                  yl]oxybutyramide                                                               hydrobromide                                                                   ______________________________________                                     

What is claimed is:
 1. A pharmaceutical composition comprising a pharmaceutically acceptable excipient and a compound of the formula ##STR9## or an optical isomer thereof, whereinZ is O or NR² ; n is an integer of 1 to 6; R¹ and R² are independently hydrogen; alkyl of 1 to 12 carbon atoms; cycloalkyl of 3 to 12 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms; cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is optionally substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein the phenyl ring is optionally substituted with one to five halo groups, one to three lower alkyl groups, or a single group selected from lower alkoxy, --N(R³)₂, --NHCOR³, --COOH, and --COOR³ wherein R³ is lower alkyl; or R¹ and R² are combined with the N to which they are attached to form a cyclic secondary amine radical selected from the group consisting of morpholinyl, piperidinyl, pyrrolidinyl and N-methyl piperazinyl; HX is optionally present and when present represents the acid portion of a pharmaceutically acceptable acid addition salt; A is NR⁴ R⁵ wherein R⁴ and R⁵ are independently selected from the group consisting of: hydrogen; alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 2 to 6 carbon atoms; cycloalkyl of 3 to 8 carbon atoms or cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is optionally substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is optionally substituted with a lower alkyl, halo or lower alkoxy group or an --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; or wherein R⁴ and R⁵ are combined with the N to which they are attached to form a radical selected from the group consisting of: morpholinyl, piperidinyl, perhexylenyl, N-loweralkylpiperazinyl, pyrrolidinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, (±)-decahydroquinolinyl, and indolinyl.
 2. A composition of claim 1 wherein n is 3 or
 4. 3. A composition of claim 2 wherein AOC(CH₂)_(n) O is attached at position 6 of the quinazoline ring.
 4. A composition of claim 3 wherein R⁴ is alkyl of 1 to 6 carbon atoms and R⁵ is cycloalkyl of 3 to 8 carbon atoms.
 5. A composition of claim 4 wherein R⁴ is methyl and R⁵ is cyclohexyl.
 6. A composition of claim 5 wherein n is
 3. 7. A composition of claim 6 wherein R¹ is hydrogen, alkyl, optionally lower alkyl substituted cycloalkyl, optionally lower alkyl substituted phenyl, or phenyl lower alkyl optionally substituted with lower alkyl on the phenyl ring.
 8. A composition of claim 7 wherein Z is O.
 9. The composition of claim 8 wherein R¹ is H, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-carboxymethyl-3,4-dihydroquinazolin-6-yl]oxybutyramide.
 10. A pharmaceutical composition comprising a pharmaceutical excipient and a therapeutically effective amount of a compound selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isopropoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylcyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(phenyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-phenylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,2-dimethyl-3-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-phenyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethyl benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-trichloromethyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide.
 11. A composition of claim 7 wherein Z is NR₂.
 12. A composition of claim 11 wherein the compound is selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(N-t-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(4-morpholinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-piperidinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-phenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-isopropylcarbamoylmethyl)-3,4- -3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide.
 13. A composition of claim 8 wherein R¹ is ethyl, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-(ethoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, or a pharmaceutically acceptable salt thereof.
 14. A composition of claim 8 wherein R¹ has more than three carbon atoms and branching at the first or second carbon from the O.
 15. The composition of claim 14 wherein R¹ is t-butyl, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, or a pharmaceutically acceptable salt thereof.
 16. A composition of matter consisting essentially of a compound of the formula ##STR10## or an optical isomer thereof, whereinZ is O or NR² ; n is an integer of 1 to 6; R¹ and R² are independently hydrogen; alkyl of 1 to 12 carbon atoms; cycloalkyl of 3 to 8 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms; cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is optionally substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein the phenyl ring is optionally substituted with one to five halo groups, one to three lower alkyl groups, or a single group selected from lower alkoxy, --N(R³)₂, --NHCOR³, --COOH, and --COOR³ wherein R³ is lower alkyl; or R¹ and R² are combined with the N to which they are attached to form a cyclic secondary amine radical selected from the group consisting of morpholinyl, piperidinyl, pyrrolidinyl and N-methyl piperazinyl; HX is optionally present and when present represents the acid portion of a pharmaceutically acceptable acid addition salt; A is NR⁴ R⁵ wherein R⁴ and R⁵ are independently selected from the group consisting of: hydrogen; alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 2 to 6 carbon atoms or an aliphatic acylate thereof of 1 to 6 carbon atoms or an aryl acylate thereof of 7 to 12 carbon atoms; cycloalkyl of 3 to 8 carbon atoms or cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is optionally substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is optionally substituted with a lower alkyl, halo or lower alkoxy group or an --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; or wherein R⁴ and R⁵ are combined with the N to which they are attached to form a radical selected from the group consisting of: morpholinyl, piperidinyl, perhexylenyl, N-loweralkylpiperazinyl, pyrrolidinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, (±)-decahydroquinolinyl, and indolinyl.
 17. A composition of claim 16 wherein n is 3 or
 4. 18. A composition of claim 17 wherein AOC(CH₂)_(n) O is attached at position 6 of the quinazoline ring.
 19. A composition of claim 18 wherein R⁴ is alkyl of 1 to 6 carbon atoms and R⁵ is cycloalkyl of 3 to 8 carbon atoms.
 20. A composition of claim 19 wherein R⁴ is methyl and R⁵ is cyclohexyl.
 21. A composition of claim 20 wherein n is
 3. 22. A composition of claim 21 wherein R¹ is hydrogen, alkyl, optionally lower alkyl substituted cycloalkyl, optionally lower alkyl substituted phenyl, or phenyl lower alkyl optionally substituted with lower alkyl on the phenyl ring.
 23. A composition of claim 22 wherein Z is O.
 24. The composition of claim 23 wherein R¹ is H, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-carboxymethyl-3,4-dihydroquinazolin-6-yl]oxybutyramide.
 25. A composition of matter consisting essentially of a compound selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isopropoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylcyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(phenyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-phenylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,2-dimethyl-3-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-phenyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethyl benzyl-oxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-trichloromethyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin6-yl]oxybutyramide.
 26. A composition of claim 22 wherein Z is NR₂.
 27. A composition of claim 26 wherein the compound is selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(N-t-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(4-morpholinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-piperidinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-phenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-isopropylcarbamoylmethyl)-3,4- -3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide.
 28. The composition of claim 23 wherein R¹ is ethyl, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-(ethoxycarbonylmethyl)-3,4,-dihydroquinazolin-6-yl]oxybutyramide, or a pharmaceutically acceptable salt thereof.
 29. A composition of claim 23 wherein R¹ has more than three carbon atoms and branching at the first or second carbon from the O.
 30. The composition of claim 29 wherein R¹ is t-butyl, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide, or a pharmaceutically acceptable salt thereof.
 31. A compound of the formula ##STR11## or an optical isomer thereof, whereinZ is O or NR² ; n is an integer of 1 to 6; R¹ and R² are independently hydrogen; alkyl of 3 to 12 carbon atoms if Z is O, or of 1 to 12 carbon atoms if Z is NR² ; cycloalkyl of 3 to 12 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms; cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is unsubstituted or substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is unsubstituted or substituted with one to five halo groups, one to three lower alkyl groups, or a single group selected from lower alkoxy, --N(R³)₂, --NHCOR³, --COOH, and --COOR³ wherein R³ is lower alkyl; or R¹ and R² are combined with the N to which they are attached to form a cyclic secondary amine radical selected from the group consisting of morpholinyl, piperidinyl, pyrrolidinyl and N-methyl piperazinyl; HX is optionally present and when present represents the acid portion of a pharmaceutically acceptable acid addition salt; A is NR⁴ R⁵ wherein R⁴ and R⁵ are independently selected from the group consisting of: hydrogen; alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 2 to 6 carbon atoms; cycloalkyl of 3 to 8 carbon atoms or cycloalkyl lower alkyl of 4 to 12 carbon atoms wherein the cycloalkyl ring is unsubstituted or substituted with a lower alkyl, lower alkoxy, --OH, --OCOR³, halo, --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; and phenyl or phenyl lower alkyl wherein phenyl is unsubstituted or substituted with a lower alkyl, halo or lower alkoxy group or an --N(R³)₂, --NHCOR³, --COOH, or --COOR³ group wherein R³ is lower alkyl; or wherein R⁴ and R⁵ are combined with the N to which they are attached to form a radical selected from the group consisting of: morpholinyl, piperidinyl, perhexylenyl, N-loweralkylpiperazinyl, pyrrolidinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, (±)-decahydroquinolinyl, and indolinyl.
 32. A compound of claim 31 wherein n is 3 or
 4. 33. A compound of claim 32 whrein AOC(CH₂)_(n) O is attached at position 6 of the quinazoline ring.
 34. A compound of claim 33 wherein R⁴ is alkyl of 1 to 6 carbon atoms and R⁵ is cycloalkyl of 3 to 8 carbon atoms.
 35. A compound of claim 34 wherein R⁴ is methyl and R⁵ is cyclohexyl.
 36. A compound of claim 35 wherein n is
 3. 37. A compound of claim 36 wherein R¹ is hydrogen, alkyl, optionally lower alkyl substituted cycloalkyl, optionally lower alkyl substituted phenyl, or phenyl lower alkyl optionally substituted with lower alkyl on the phenyl ring.
 38. A compound of claim 37 wherein Z is O.
 39. The composition of claim 38 wherein R¹ is H, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-carboxymethyl-3,4-dihydroquinazolin-6-yl]oxybutyramide.
 40. A compound of claim 38 selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(t-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isopropoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylcyclohexyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(cyclopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(isobutyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(neopentyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(phenyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,6-dimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-phenylethyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,2-dimethyl-3-butyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-phenyl-2-propyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(benzyloxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethyl benzyl-oxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; N-cyclohexyl-N-methyl-4-[2-amino-3-(2-trichloromethyl-2-propyl-oxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(2,4,6-trimethylphenoxycarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide.
 41. A compound of claim 37 wherein Z is NR₂.
 42. A compound of claim 41 selected from the group consisting of:N-cyclohexyl-N-methyl-4-[2-amino-3-(carbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(N-t-butylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(4-morpholinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-(1-piperidinylcarbonylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-phenylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; N-cyclohexyl-N-methyl-4-[2-amino-3-N-isopropylcarbamoylmethyl)-3,4- -3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-N,N-dimethylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide; and N-cyclohexyl-N-methyl-4-[2-amino-3-(N-cyclohexylcarbamoylmethyl)-3,4-dihydroquinazolin-6-yl]oxybutyramide hydrobromide.
 43. A compound of claim 38 wherein R¹ has more than three carbon atoms and branching at the first or second carbon from the O.
 44. The compound of claim 43 wherein R¹ is tert-butyl, namely, N-cyclohexyl-N-methyl-4-[2-amino-3-(tert-butyloxycarbonylmethyl)-3,4,-dihydroquinazolin-6-yl]oxybutyramide, or a pharmaceutically acceptable salt thereof. 